Stepped bristle array for a toothbrush head



FIG. 1 is a perspective view of my ornamental design for a stepped bristle array for a toothbrush head;

FIG. 2 is a front view thereof;

FIG. 3 is a plan, bottom view thereof;

FIG. 4 is a plan, top view thereof; and,

FIG. 5 is a side view thereof.

The broken line showing of a toothbrush head is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design for a stepped bristle array for a toothbrush head, as shown and described. 